poisson_loss(ŷ, y; agg = mean)

Return how much the predicted distribution ŷ diverges from the expected Poisson distribution y; calculated as -

			sum(ŷ .- y .* log.(ŷ)) / size(y, 2)

More information. .

Example

			julia> y_model = [1, 3, 3];  # data should only take integral values

julia> Flux.poisson_loss(y_model, 1:3)
0.5023128522198171